Julia Roberts joined Instagram only a few months ago, but she's already proving to be a pro. The movie legend has been posting selfies, throwback pics, and photos with family and friends. In fact, she's mastered the art of social media so well that she's even progressed to taking on mean comments from Internet trolls — even when they're not on her own page.

A vintage costume collector recently posted a side-by-side of Roberts next to Joan Crawford, wearing similar gowns. One opinionated commenter shared their colorful feelings on Julia versus Joan by penning, "Joan Crawford looks way better in my opinion. More classic and refined, and Julia is wearing ugly black nail polish!"

Roberts apparently saw the comment because she came back with a burn that any Instagram veteran would be proud to have responded with: "It is in a fact a navy nail polish with garnets crystals as a grounding accent. In case you would like to edit your comment from 'ugly black nail polish' to ugly navy polish with garnet crystals. Just sayin,'" adding a painted-nails emoji for dramatic flair.

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Hopefully, Roberts is having too much fun using Instagram to let trolls bother her. The actress recently 'grammed her first photo with her husband, cinematographer Danny Moder. In the personal picture, husband and wife are seen embracing on the beach. "Oh Summer, thank you! You made us happy and brave. We embraced every moment of sun drenched JOY," she wrote.